Multispectral filter

ABSTRACT

An optical device may comprise an array of sensor elements that includes a plurality of pixels and a multispectral filter disposed on the array of sensor elements. The multispectral filter may be configured to pass a first transmission percentage of light of a particular spectral range to a first set of pixels of the plurality of pixels and pass a second transmission percentage of light of the particular spectral range to a second set of pixels of the plurality of pixels.

RELATED APPLICATION

This application is a continuation of U.S. patent application Ser. No.16/822,929, filed Mar. 18, 2020, which is incorporated herein byreference in its entirety.

BACKGROUND

A multispectral sensor device may be utilized to capture information.For example, the multispectral sensor device may capture informationrelating to a set of electromagnetic frequencies. The multispectralsensor device may include a set of sensor elements (e.g., opticalsensors, spectral sensors, and/or image sensors) that capture theinformation. For example, an array of sensor elements may be utilized tocapture information relating to multiple frequencies.

SUMMARY

According to some implementations, an optical device comprises an arrayof sensor elements that includes a plurality of pixels and amultispectral filter disposed on the array of sensor elements,configured to pass a first transmission percentage of light of aparticular spectral range to a first set of pixels of the plurality ofpixels and pass a second transmission percentage of light of theparticular spectral range to a second set of pixels of the plurality ofpixels.

According to some implementations, a system comprises an array of sensorelements and a multispectral filter comprising a plurality of opticalchannels that is disposed on at least a portion of the array of sensorelements, the multispectral filter configured to pass a firsttransmission percentage of bandpass filtered light associated with aparticular spectral range to the array of sensor elements and pass asecond transmission percentage of bandpass filtered light associatedwith the particular spectral range to the array of sensor elements.

According to some implementations, a multispectral filter comprises aplurality of optical channels, wherein one or more optical channels, ofthe plurality of optical channels, are configured to pass a firsttransmission percentage of light associated with a particular spectralrange to a first set of pixels of a multispectral sensor device and passa second transmission percentage of light associated with the particularspectral range to a second set of pixels of a multispectral sensordevice.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram of an example sensor system described herein.

FIGS. 2-4 are diagrams of one or more example implementations describedherein.

DETAILED DESCRIPTION

The following detailed description of example implementations refers tothe accompanying drawings. The same reference numbers in differentdrawings may identify the same or similar elements.

An optical filter (e.g., a multispectral filter) may include a set ofoptical channels designed to transmit light in different spectral ranges(e.g., wavelength ranges). For example, the set of optical channels mayinclude discrete gratings or bandpass filters, each of which may bedesigned to pass light in a respective spectral range. The opticalfilter may be included in an optical device, such as a multispectralsensor device, that includes a set of sensor elements (e.g., opticalsensors) to capture spectral data relating to different wavelengths oflight (based on wavelengths of light passed by the optical filter)related to a target object (e.g., that emits and/or reflects light tothe optical device).

In many cases, each optical channel of the set of optical channels ofthe optical filter may be configured to pass bandpass filtered light(e.g., light of a particular spectral range, such as light that may havea spectral width of 10-100 nanometers) to a respective set of pixelsassociated with the set of sensor elements of the multispectral sensordevice. However, the set of sensor elements may be more sensitive tosome spectral ranges than others, more light associated with onespectral range may pass to the set of sensor elements than lightassociated with another spectral range, and/or the like, which may causethe set of sensor elements to obtain too much data relating to somespectral ranges (e.g., be overexposed to light) and not enough datarelated to other spectral ranges (e.g., be underexposed to light) duringa particular integration time.

In some cases, the set of sensor elements may be configured to capturemultiple “frames” that are respectively associated with differentintegration times, so that an optimal amount of data may be obtained foreach spectral range associated with the set of optical channels. Themultiple frames can be processed (e.g., using complex mathematicalalgorithms) to create a single frame with a high dynamic range (HDR)that indicates representative data associated with each spectral range.However, this may involve a use of computing resources (e.g., processingresources, memory resources, power resources, and/or the like) of adevice to create the HDR frame. Moreover, taking additional time tocapture multiple frames and/or to combine the multiple frames may causean inaccurate and/or outdated HDR frame to be created.

Some implementations described herein provide an optical filter (e.g., amultispectral filter) that can pass different transmission percentagesof light associated with different spectral ranges to an array of sensorelements. For example, in some implementations, a first optical channelof the optical filter may pass a first transmission percentage (e.g.,100% or near 100%) of light associated with a particular spectral rangeto the array of sensor elements, and a second optical channel of theoptical filter may pass a second transmission percentage (e.g., 65%) oflight associated with the particular spectral range (e.g., the sameparticular spectral range associated with the first optical channel) tothe array of sensor elements. As another example, in someimplementations, a first optical channel section of an optical channelof the optical filter may pass a first transmission percentage (e.g.,15%) of light associated with a particular spectral range to the arrayof sensor elements, and a second optical channel section of the opticalchannel of the optical filter may pass a second transmission percentage(e.g., 57%) of light associated with the particular spectral range(e.g., the same particular spectral range associated with the firstoptical channel section) to the array of sensor elements.

In this way, some implementations described herein allow differentamounts of light associated with one or more respective spectral rangesto pass to the multispectral sensor, increasing a likelihood that themultispectral sensor can capture an optimal amount of light for eachspectral range in a single frame (e.g., during a particular integrationtime). This single frame may have as much or more information as an HDRframe composed of multiple frames described above. Accordingly,computing resources do not need to be used to obtain the single framethat would otherwise be used to create the HDR frame. Moreover, thesingle frame may be more accurate than an HDR frame because the singleframe is associated with light captured during a single integrationtime, rather than multiple integration times. This may also enable theoptical filter to support time-sensitive applications.

FIG. 1 is a diagram of an example implementation 100 described herein.As shown in FIG. 1 , example implementation 100 includes a sensor system110. Sensor system 110 may be a portion of an optical system (e.g., anoptical device), and may provide an electrical output corresponding to asensor determination. For example, sensor system 110 may be a portion ofa biometric system, a security system, a health monitoring system, anobject identification system, a spectroscopic identification system, animaging system, and/or the like. Sensor system 110 includes an opticalfilter structure 120, which includes an optical filter 130, and an arrayof sensor elements 140 (e.g., a set of optical sensors). For example,optical filter structure 120 may include an optical filter 130 thatincludes one or more optical channels, where a set of the opticalchannels is configured to pass multiple different transmissionpercentages of light associated with a particular spectral range torespective sets of pixels of the array of sensor elements 140.

In some implementations, optical filter 130 may be a multispectralfilter (e.g., that includes an array of optical channels), such as amultispectral filter coupled to a multispectral sensor (e.g., the arrayof sensor elements 140). The optical filter 130 may be coextensive withthe array of sensor elements 140 (e.g., a face of the optical filter 130may be aligned with a face of the array of sensor elements 140) or maybe coextensive with a portion of the array of sensor elements 140 (e.g.,a face of the optical filter 130 may be aligned with a portion of thearray of sensor elements 140). In some implementations, the array ofsensor elements 140 may include a plurality of pixels (e.g., aparticular number of pixels may be included in each sensor element ofthe array of sensor elements).

Sensor system 110 may include an optical transmitter 150 (e.g., a lightsource) that transmits an optical signal toward a target 160 (e.g., aperson, a finger of the person, an object, and/or the like). The opticalsignal may include broadband light emitted by the optical transmitter150 and/or ambient light from the environment in which sensor system 110is being utilized. In some implementations, sensor system 110 mayperform sensing without using an optical transmitter 150 to transmit anoptical signal toward a target 160. As shown by reference number 170,the optical signal is directed toward the optical filter structure 120.For example, optical transmitter 150 may direct an optical signal thatcomprises multiple wavelength ranges of visible light, near-infraredlight, mid-infrared light, ultraviolet light, and/or the like toward anobject (e.g., the target 160) and the optical signal may be reflectedoff the object toward the optical filter structure 120 to permit atleast one sensor element of the array of sensor elements 140 to performa measurement of light associated with a particular spectral range ofthe optical signal. Additionally, or alternatively, the optical signalmay include light emitted by the object or other light from theenvironment. In some implementations, at least a portion of the opticalsignal is passed by the optical filter 130 to the array of sensorelements 140.

As further shown in FIG. 1 , and by reference number 180, based on theat least a portion of the optical signal being passed to the array ofsensor elements 140, the array of sensor elements 140 may provide anoutput electrical signal (e.g., a digital electrical signal, an analogelectrical signal, and/or the like) for sensor system 110, such as foruse in performing a multispectral measurement, recognizing a gesture ofthe user, detecting the presence of an object, and/or the like.

As indicated above, FIG. 1 is provided merely as an example. Otherexamples may differ from what is described with regard to FIG. 1 .

FIG. 2 is a diagram of an example implementation 200 described herein.As shown in FIG. 2 , example implementation 200 includes a multispectralfilter 210. The multispectral filter 210 may be divided into a pluralityof filter sections 220. As shown in FIG. 2 , the multispectral filter210 may include filter sections 220-1 through 220-4, but contemplatedimplementations include any number of filter sections. Each filtersection, of the plurality of filter sections 220, may include one ormore optical channels 230. As shown in FIG. 2 , the filter section 220-1includes 64 optical channels 230-1, the filter section 220-2 includes 64optical channels 230-2, the filter section 220-3 includes 64 opticalchannels 230-3, and the filter section 220-4 includes 64 opticalchannels 230-4, but contemplated implementations include any number ofoptical channels included in a filter section. While FIG. 2 shows filtersections and optical channels having square shapes, each filter sectionand/or optical channel may have any other type of shape, such as arectangle, an oval, a circle, a pentagon, a hexagon, another type ofpolygon, an irregular shape, and/or the like.

The multispectral filter 210 may be disposed on an array of sensorelements (e.g., the array of sensor elements 140). For example, a faceof the multispectral filter 210 may be attached to a face of the arrayof sensor elements such that the multispectral filter 210 and the arrayof sensor elements are coextensive. Additionally, or alternatively, themultispectral filter 210 may be disposed on the array of sensor elementssuch that the one or more optical channels 230 respectively correspondto one or more sets of pixels, of a plurality of pixels, included in thearray of sensor elements.

In some implementations, each optical channel of a filter section may beconfigured to pass light of a particular spectral range to acorresponding set of pixels of the array of sensor elements. Forexample, each optical channel may include a bandpass filter associatedwith a particular spectral range to pass bandpass filtered lightassociated with the particular spectral range to a corresponding set ofpixels of the array of sensor elements.

In some implementations, a respective optical channel of each filtersection, of the plurality of filter sections 220, may be configured topass light of the same particular spectral range. For example, as shownin FIG. 2 , optical channel 230-1-A of filter section 220-1, opticalchannel 230-2-A of filter section 220-2, optical channel 230-3-A offilter section 220-3, and optical channel 230-4-A of filter section220-4 may each be configured to pass light of the same particularspectral range (e.g., optical channel 230-1-A, optical channel 230-2-A,optical channel 230-3-A, and optical channel 230-4-A may correspond toeach other). While FIG. 2 shows optical channel 230-1-A, optical channel230-2-A, optical channel 230-3-A, and optical channel 230-4-A having thesame relative position (e.g., an upper left position) within filtersection 220-1, filter section 220-2, filter section 220-3, and filtersection 220-4, contemplated implementations include correspondingoptical channels having the same or different relative positions withinrespective filter sections.

In some implementations, each filter section, of the plurality of filtersections 220, may be associated with a particular transmissionpercentage of light (e.g., a percentage amount of light that passesthrough an optical channel of the filter section). For example, asindicated by the different amounts of shading in FIG. 2 , filter section220-1, which has no shading, may be associated with a high transmissionpercentage (e.g., greater than 90% and less than or equal to 100%);filter section 220-2, which has a small amount of shading, may beassociated with a moderately high transmission percentage (e.g., greaterthan 80% and less than or equal to 90%); filter section 220-3, which hasa moderate amount of shading, may be associated with a moderately lowtransmission percentage (e.g., greater than 70% and less than or equalto 80%); and filter section 220-4, which has a large amount of shading,may be associated with a low transmission percentage (e.g., greater than0% and less than or equal to 70%).

In some implementations, an optical density coating (e.g., comprisingone or more optical thin films) associated with a transmissionpercentage may be formed, applied, and/or the like to a face of a filtersection to ensure that each optical channel of the filter section isconfigured to pass the transmission percentage of light. For example, anoptical density coating associated with a high transmission percentagemay be disposed on filter section 220-1 (e.g., disposed on all of filtersection 220-1 or at least a portion of filter section 220-1 thatincludes the optical channels 230-1); an optical density coatingassociated with a moderately high transmission percentage may bedisposed on filter section 220-2 (e.g., disposed on all of filtersection 220-2 or at least a portion of filter section 220-2 thatincludes the optical channels 230-2); an optical density coatingassociated with a moderately low transmission percentage may be disposedon filter section 220-3 (e.g., disposed on all of filter section 220-3or at least a portion of filter section 220-3 that includes the opticalchannels 230-3); and/or an optical density coating associated with a lowtransmission percentage may be disposed on filter section 220-4 (e.g.,disposed on all of filter section 220-4 or at least a portion of filtersection 220-4 that includes the optical channels 230-4).

Additionally, or alternatively, each optical channel of a filter sectionmay include the same optical density coating associated with atransmission percentage to ensure that each optical channel of thefilter section is configured to pass the transmission percentage oflight. For example, each optical channel, of the optical channels 230-1,may include an optical density coating associated with a hightransmission percentage; each optical channel, of the optical channels230-2, may include an optical density coating associated with amoderately high transmission percentage; each optical channel, of theoptical channels 230-3, may include an optical density coatingassociated with a moderately low transmission percentage; and/or eachoptical channel, of the optical channels 230-4, may include an opticaldensity coating associated with a low transmission percentage.

Accordingly, each optical channel of the optical channels 230-1 offilter section 220-1 may be configured to pass a high transmissionpercentage of light; each optical channel of the optical channels 230-2of filter section 220-2 may be configured to pass a moderately hightransmission percentage of light; each optical channel of the opticalchannels 230-3 of filter section 220-3 may be configured to pass amoderately low transmission percentage of light; and/or each opticalchannel of the optical channels 230-4 of filter section 220-4 may beconfigured to pass a low transmission percentage of light.

In an additional example, as shown in FIG. 2 , optical channel 230-1-Aof filter section 220-1 may be configured to pass a first transmissionpercentage (e.g., a high transmission percentage) of light of aparticular spectral range to a first set of pixels of the array ofsensor elements; optical channel 230-2-A of filter section 220-2 may beconfigured to pass a second transmission percentage (e.g., a moderatelyhigh transmission percentage) of light of the particular spectral rangeto a second set of pixels of the array of sensor elements; opticalchannel 230-3-A of filter section 220-3 may be configured to pass athird transmission percentage (e.g., a moderately low transmissionpercentage) of light of the particular spectral range to a third set ofpixels of the array of sensor elements; and/or optical channel 230-4-Aof filter section 220-4 may be configured to pass a fourth transmissionpercentage (e.g., a low transmission percentage) of light of theparticular spectral range to a fourth set of pixels of the array ofsensor elements.

As indicated above, FIG. 2 is provided merely as an example. Otherexamples may differ from what is described with regard to FIG. 2 .

FIG. 3 is a diagram of an example implementation 300 described herein.As shown in FIG. 3 , example implementation 300 includes a multispectralfilter 310. The multispectral filter 310 may include one or more opticalchannels 320. As shown in FIG. 3 , the multispectral filter 310 mayinclude 64 optical channels 320, but contemplated implementationsinclude any number of optical channels included in the multispectralfilter 310. Each optical channel, of the one or more optical channels320, may include a plurality of optical channel sections 330. As shownin FIG. 3 , an optical channel may include optical channel sections330-1 through 330-4, but contemplated implementations include any numberof optical channel sections 330. While FIG. 3 shows the one or moreoptical channels 320 and the plurality of optical channel sections 330having square shapes, each optical channel and/or optical channelsection may have any other type of shape, such as a rectangle, an oval,a circle, a pentagon, a hexagon, another type of polygon, an irregularshape, and/or the like.

In some implementations, the multispectral filter 310 may be disposed onan array of sensor elements (e.g., the array of sensor elements 140).For example, a face of the multispectral filter 310 may be attached to aface of the array of sensor elements such that the multispectral filter310 and the array of sensor elements are coextensive. Additionally, oralternatively, the multispectral filter 310 may be disposed on the arrayof sensor elements such that the one or more optical channels 320 and/orthe plurality of optical channel sections 330 respectively correspond toone or more sets of pixels of the array of sensor elements.

In some implementations, each optical channel, of the one or moreoptical channels 320, may be configured to pass light of a particularspectral range to a corresponding set of pixels of the array of sensorelements. For example, each optical channel may include a bandpassfilter associated with a particular spectral range to pass bandpassfiltered light associated with the particular spectral range to acorresponding set of pixels of the array of sensor elements.

In some implementations, each optical channel section, of the pluralityof optical channel sections 330 of an optical channel, may be associatedwith a particular transmission percentage (e.g., a percentage amount oflight that passes through an optical channel section of the opticalchannel). For example, as indicated by the amount of shading in FIG. 3 ,optical channel section 330-1, which has no shading, may be associatedwith a high transmission percentage (e.g., greater than 90% and lessthan or equal to 100%); optical channel section 330-2, which has a smallamount of shading, may be associated with a moderately high transmissionpercentage (e.g., greater than 80% and less than or equal to 90%);optical channel section 330-3, which has a moderate amount of shading,may be associated with a moderately low transmission percentage (e.g.,greater than 70% and less than or equal to 80%), and optical channelsection 330-4, which has a large amount of shading, may be associatedwith a low transmission percentage (e.g., greater than 0% and less thanor equal to 70%). In some implementations, a respective optical densitycoating (e.g., comprising one or more optical thin films) associatedwith a transmission percentage may be formed on, applied to, disposedon, included in and/or the like each optical channel section of anoptical channel to enable each optical channel section to pass theassociated transmission percentage of light. Accordingly, the opticalchannel section 330-1 may be configured to pass a high transmissionpercentage of light; the optical channel section 330-2 may be configuredto pass a moderately high transmission percentage of light; the opticalchannel section 330-3 may be configured to pass a moderately lowtransmission percentage of light; and/or the optical channel section330-4 may be configured to pass a low transmission percentage of light.

As another example, as shown in FIG. 3 , optical channel section 330-1of an optical channel may be configured to pass a first transmissionpercentage (e.g., a high transmission percentage) of light of aparticular spectral range to a first set of pixels of the array ofsensor elements; optical channel section 330-2 of the optical channelmay be configured to pass a second transmission percentage (e.g., amoderately high transmission percentage) of light of the particularspectral range to a second set of pixels of the array of sensorelements; optical channel section 330-3 of the optical channel may beconfigured to pass a third transmission percentage (e.g., a moderatelylow transmission percentage) of light of the particular spectral rangeto a third set of pixels of the array of sensor elements; and/or opticalchannel section 330-4 of the optical channel may be configured to pass afourth transmission percentage (e.g., a low transmission percentage) oflight of the particular spectral range to a fourth set of pixels of thearray of sensor elements.

As indicated above, FIG. 3 is provided merely as an example. Otherexamples may differ from what is described with regard to FIG. 3 .

FIG. 4 is a diagram of an example implementation 400 described herein.As shown in FIG. 4 , example implementation 400 includes a multispectralfilter 410. The multispectral filter 410 may include one or more opticalchannels 420. As shown in FIG. 4 , the multispectral filter 410 mayinclude 16 optical channels 420, but contemplated implementationsinclude any number of optical channels included in the multispectralfilter 410. Each optical channel, of the one or more optical channels420, may include a plurality of optical channel sections 430. As shownin FIG. 4 , an optical channel may include optical channel sections430-1 and 430-2, but contemplated implementations include any number ofoptical channel sections 430. While FIG. 4 shows the one or more opticalchannels 420 and the plurality of optical channel sections 430 havingsquare shapes and rectangle shapes, each optical channel and/or opticalchannel section may have any other type of shape, such as an oval, acircle, a pentagon, a hexagon, another type of polygon, an irregularshape, and/or the like.

In some implementations, the multispectral filter 410 may be disposed ona portion of an array of sensor elements (e.g., the array of sensorelements 140). For example, a face of the multispectral filter 410 maybe attached to a face of the array of sensor elements such that themultispectral filter 410 covers a portion of the array of sensorelements. Additionally, or alternatively, the multispectral filter 410may be disposed on the array of sensor elements such that the one ormore optical channels 420 respectively correspond to one or more sets ofpixels of the array of sensor elements and/or that the plurality ofoptical channel sections 430 respectively correspond to a plurality ofsubsets of pixels of the array of sensor elements. In someimplementations, the multispectral filter 410 may be disposed on aportion of the array of sensor elements such that one or more otheroptical filters (e.g., that are similar to the multispectral filter 410)may also be disposed on the array of sensor elements. For example, fourmultispectral filters 410 may be disposed on the array of sensorelements, such that each multispectral filter 410 acts similar to afilter section as described herein in relation to FIG. 2 .

In some implementations, each optical channel, of the one or moreoptical channels 420, may be configured to pass light of a particularspectral range to a corresponding set of pixels of the array of sensorelements. For example, each optical channel may include a bandpassfilter associated with a particular spectral range to pass bandpassfiltered light associated with the particular spectral range to acorresponding set of pixels of the array of sensor elements.

In some implementations, each optical channel section, of the pluralityof optical channel sections 430 of an optical channel, may be associatedwith a particular transmission percentage (e.g., a percentage amount oflight that passes through an optical channel section of the opticalchannel). For example, as indicated by the shading in FIG. 4 , opticalchannel section 430-1, which has no shading, may be associated with ahigh transmission percentage (e.g., greater than 50% and less than orequal to 100%) and optical channel section 430-2, which has shading, maybe associated with a low transmission percentage (e.g., greater than 0%and less than or equal to 50%). In some implementations, a respectiveoptical density coating (e.g., comprising one or more optical thinfilms) associated with a transmission percentage may be formed on,applied to, disposed on, included in and/or the like each opticalchannel section of an optical channel to enable each optical section topass the associated transmission percentage of light. Accordingly, theoptical channel section 430-1 may be configured to pass a hightransmission percentage of light and the optical channel section 430-2may be configured to pass a low transmission percentage of light.

As another example, as shown in FIG. 4 , optical channel section 430-1of an optical channel may be configured to pass a first transmissionpercentage (e.g., a high transmission percentage) of light of aparticular spectral range to a first set of pixels of the array ofsensor elements and optical channel section 430-2 of the optical channelmay be configured to pass a second transmission percentage (e.g., a lowtransmission percentage) of light of the particular spectral range to asecond set of pixels of the array of sensor elements.

As indicated above, FIG. 4 is provided merely as an example. Otherexamples may differ from what is described with regard to FIG. 4 .

The foregoing disclosure provides illustration and description, but isnot intended to be exhaustive or to limit the implementations to theprecise forms disclosed. Modifications and variations may be made inlight of the above disclosure or may be acquired from practice of theimplementations.

Even though particular combinations of features are recited in theclaims and/or disclosed in the specification, these combinations are notintended to limit the disclosure of various implementations. In fact,many of these features may be combined in ways not specifically recitedin the claims and/or disclosed in the specification. Although eachdependent claim listed below may directly depend on only one claim, thedisclosure of various implementations includes each dependent claim incombination with every other claim in the claim set.

No element, act, or instruction used herein should be construed ascritical or essential unless explicitly described as such. Also, as usedherein, the articles “a” and “an” are intended to include one or moreitems, and may be used interchangeably with “one or more.” Further, asused herein, the article “the” is intended to include one or more itemsreferenced in connection with the article “the” and may be usedinterchangeably with “the one or more.” Furthermore, as used herein, theterm “set” is intended to include one or more items (e.g., relateditems, unrelated items, a combination of related and unrelated items,etc.), and may be used interchangeably with “one or more.” Where onlyone item is intended, the phrase “only one” or similar language is used.Also, as used herein, the terms “has,” “have,” “having,” or the like areintended to be open-ended terms. Further, the phrase “based on” isintended to mean “based, at least in part, on” unless explicitly statedotherwise. Also, as used herein, the term “or” is intended to beinclusive when used in a series and may be used interchangeably with“and/or,” unless explicitly stated otherwise (e.g., if used incombination with “either” or “only one of”).

What is claimed is:
 1. An optical device comprising: a plurality ofoptical channels comprising an optical channel, the optical channelcomprising: a first section configured to pass a first transmissionpercentage of light of a particular spectral range, and a second sectionconfigured to pass a second transmission percentage of light of theparticular spectral range, wherein the second transmission percentage isdifferent from the first transmission percentage.
 2. The optical deviceof claim 1, wherein the first section is configured to pass the firsttransmission percentage of light of the particular spectral range to afirst set of pixels of a plurality of pixels, and wherein the secondsection is configured to pass the second transmission percentage oflight of the particular spectral range to a second set of pixels of theplurality of pixels.
 3. The optical device of claim 1, wherein the firsttransmission percentage is greater than 90% and less than or equal to100%.
 4. The optical device of claim 1, wherein the second transmissionpercentage is greater than 80% and less than or equal to 90%.
 5. Theoptical device of claim 1, wherein the optical channel furthercomprises: a third section configured to pass a third transmissionpercentage of light of the particular spectral range.
 6. The opticaldevice of claim 5, wherein the first transmission percentage is greaterthan 70% and less than or equal to 80%.
 7. The optical device of claim5, wherein the optical channel further comprises: a fourth sectionconfigured to pass a fourth transmission percentage of light of theparticular spectral range, wherein the fourth transmission percentage isgreater than 0% and less than or equal to 70%.
 8. The optical device ofclaim 1, wherein the first section includes a first optical densitycoating associated with the first transmission percentage, and whereinthe second section includes a second optical density coating associatedwith the second transmission percentage.
 9. The optical device of claim8, wherein the first optical density coating comprises one or moreoptical thin films.
 10. The optical device of claim 1, wherein theplurality of optical channels is an array of optical channels of amultispectral filter that is coupled to a multispectral sensor thatincludes an array of sensor elements.
 11. A multispectral filtercomprising: one or more optical channels comprising an optical channel,the optical channel comprising a plurality of optical channel sections,the plurality of optical channel sections comprising: a first sectionconfigured to pass a first transmission percentage of light of aparticular spectral range to a first set of pixels of an array of sensorelements, and a second section configured to pass a second transmissionpercentage of light,  the second transmission percentage being differentfrom the first transmission percentage.
 12. The multispectral filter ofclaim 11, wherein the one or more optical channels includes 64 opticalchannels.
 13. The multispectral filter of claim 11, wherein theplurality of optical channel sections includes four optical channelsections.
 14. The multispectral filter of claim 11, wherein the one ormore optical channels are square.
 15. The multispectral filter of claim11, wherein the plurality of optical channel sections are square. 16.The multispectral filter of claim 11, wherein a face of themultispectral filter is configured to be attached to a face of the arrayof sensor elements.
 17. The multispectral filter of claim 11, whereinthe first transmission percentage of light is greater than 90% and lessthan or equal to 100%.
 18. A device comprising: an array of sensorelements; and a multispectral filter disposed on a portion of the arrayof sensor elements, the multispectral filter comprising a plurality ofoptical channels, an optical channel, of the plurality of opticalchannels, including a first optical section and a second opticalsection, the first optical section being configured to pass a firsttransmission percentage of light of a particular spectral range, thesecond optical section being configured to pass a second transmissionpercentage of light, the second transmission percentage being differentthat the first transmission percentage.
 19. The device of claim 18,wherein the plurality of optical channels includes 16 optical channels.20. The device of claim 18, wherein the first transmission percentage isgreater than 90%, and wherein the second transmission percentage is lessthan or equal to 90%.
 21. The device of claim 18, wherein the opticalchannel further includes a third optical section and a fourth opticalsection.
 22. The device of claim 21, wherein the first optical sectionis different from the second optical section, the third optical section,and the fourth optical section, wherein the second optical section isdifferent from the third optical section and the fourth optical section,and wherein the third optical section is different from the fourthoptical section.